13721403 has 4 divisors (see below), whose sum is σ = 18295208. Its totient is φ = 9147600.

The previous prime is 13721381. The next prime is 13721419. The reversal of 13721403 is 30412731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30412731 = 3 ⋅10137577.

It is not a de Polignac number, because 13721403 - 2⁵ = 13721371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13721403.

It is not an unprimeable number, because it can be changed into a prime (13721423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2286898 + ... + 2286903.

It is an arithmetic number, because the mean of its divisors is an integer number (4573802).

Almost surely, 2^13721403 is an apocalyptic number.

13721403 is a deficient number, since it is larger than the sum of its proper divisors (4573805).

13721403 is an equidigital number, since it uses as much as digits as its factorization.

13721403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4573804.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 13721403 is about 3704.2412178475. The cubic root of 13721403 is about 239.4047924479.

It can be divided in two parts, 1372 and 1403, that added together give a triangular number (2775 = T₇₄).

The spelling of 13721403 in words is "thirteen million, seven hundred twenty-one thousand, four hundred three".